Effect of occlusal loading and mechanical properties of resin composite on stress generated in posterior restorations

Aline A. Bicalho, Daranee Versluis, Antheunis Versluis, Carlos J. Soares

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Purpose: To investigate the effect of the occlusal load condition in association with the mechanical properties of resin composite, expressed by elastic modulus and post-gel shrinkage, on stresses in a premolar restored with various composites. Methods: Five resin composites (4 Seasons, Beautifil II, Filtek LS, Filtek Z250, and Z100) indicated for restoring posterior teeth were tested. Elastic modulus was measured using Knoop indentation tests (n=5). Post-gel shrinkage was measured with strain gouges (n=10). Finite element analysis was used to calculate the stresses in a twodimensional pre-molar model under four conditions: (Wc, without occlusal contact, representing stresses due to composite shrinkage only, Ct: contact generated between enamel of restored tooth and antagonist tooth; Cm: contact on tooth/composite restoration margin; Cc: stable centric contact on the composite restoration). Results: Elastic modulus varied between 12.6 (Filtek LS) and 21.5 (Z100) GPa; post-gel shrinkage varied between 0.11 (Filtek LS) and 0.96 (Z100) vol%. Composites with higher elastic modulus and post-gel shrinkage increased stress in the restored tooth. Occlusal contact on the tooth/composite restoration margin increased the stresses around the margin of the restoration. Stable centric contact on the restoration resulted in better stress distribution. CLINICAL SIGNIFICANCE: Stresses in the restored tooth increased with increasing elastic modulus and post-gel shrinkage. Contact close to the restoration margin increased the local stress concentration regardless of composite properties. Occlusal adjustment after posterior restoration to prevent contact at the margin is important to improve stress distribution and preserve the restoration integrity.

Original languageEnglish (US)
Pages (from-to)129-133
Number of pages5
JournalAmerican Journal of Dentistry
Volume27
Issue number3
StatePublished - Jan 1 2014
Externally publishedYes

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Composite Resins
Tooth
Elastic Modulus
Gels
Occlusal Adjustment
Finite Element Analysis
Bicuspid
Dental Enamel

All Science Journal Classification (ASJC) codes

  • Medicine(all)
  • Dentistry(all)

Cite this

Effect of occlusal loading and mechanical properties of resin composite on stress generated in posterior restorations. / Bicalho, Aline A.; Versluis, Daranee; Versluis, Antheunis; Soares, Carlos J.

In: American Journal of Dentistry, Vol. 27, No. 3, 01.01.2014, p. 129-133.

Research output: Contribution to journalArticle

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abstract = "Purpose: To investigate the effect of the occlusal load condition in association with the mechanical properties of resin composite, expressed by elastic modulus and post-gel shrinkage, on stresses in a premolar restored with various composites. Methods: Five resin composites (4 Seasons, Beautifil II, Filtek LS, Filtek Z250, and Z100) indicated for restoring posterior teeth were tested. Elastic modulus was measured using Knoop indentation tests (n=5). Post-gel shrinkage was measured with strain gouges (n=10). Finite element analysis was used to calculate the stresses in a twodimensional pre-molar model under four conditions: (Wc, without occlusal contact, representing stresses due to composite shrinkage only, Ct: contact generated between enamel of restored tooth and antagonist tooth; Cm: contact on tooth/composite restoration margin; Cc: stable centric contact on the composite restoration). Results: Elastic modulus varied between 12.6 (Filtek LS) and 21.5 (Z100) GPa; post-gel shrinkage varied between 0.11 (Filtek LS) and 0.96 (Z100) vol{\%}. Composites with higher elastic modulus and post-gel shrinkage increased stress in the restored tooth. Occlusal contact on the tooth/composite restoration margin increased the stresses around the margin of the restoration. Stable centric contact on the restoration resulted in better stress distribution. CLINICAL SIGNIFICANCE: Stresses in the restored tooth increased with increasing elastic modulus and post-gel shrinkage. Contact close to the restoration margin increased the local stress concentration regardless of composite properties. Occlusal adjustment after posterior restoration to prevent contact at the margin is important to improve stress distribution and preserve the restoration integrity.",
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